Can anyone please tell me what this piece is and what it was used for.

Hmm most odd. We will need some more pictures, a side-view and underneath.

Hi, I think it could be a double lemon squeezer or if the points are only narrow it could be a ring holder

No marks?

I think this is what they call 'blue celeste' made famous by the Sevres factory and reproduced elsewhere.

Thank you everyone. There are no marks underneath but I will try and get some more details, re size ect and a photo of the base. I was trying to identify it for a friend.